Suddenly Unable to drag and drop to shared mailboxes

Hi @Greg Butler,

Welcome to the Microsoft Q&A forum, and thank you for sharing the detailed build information. I can certainly understand how disruptive this is, especially when your team relies on Favorites for managing shared mailboxes efficiently.

Based on feedback from other users running the same New Outlook client version (Client Version: 20260102003.02 / Build 20260102003): New Outlook - Drag and Drop Email to Folder in Favorites not working, this appears to be a recent regression in New Outlook. Specifically, drag‑and‑drop into shared mailbox folders that are pinned under Favorites shows the “not allowed” (red circle) cursor, even though drag‑and‑drop continues to work when targeting those same folders from their original location lower in the folder list. Several users have reported the same behavior, which helps confirm this is likely build‑related rather than an isolated configuration issue.

In the meantime, you may find the following workarounds helpful:

• Drag and drop from the shared mailbox’s original folder location (outside of Favorites). While less convenient, this does continue to work as expected.
• Switch temporarily to Classic Outlook, as multiple users have confirmed that this issue does not occur there.

Since this behavior appears tied to the current rollout, the most effective next step is for your Microsoft 365 administrator to submit a support request through the Microsoft 365 Admin Center. When doing so, it’s helpful to include:

• The affected client/build numbers.
• Confirmation that the issue only affects shared mailbox folders pinned to Favorites.
• Clear reproduction steps along with screenshots or a short video.

Your IT admin can create a support ticket by sign in to the Microsoft 365 Admin Center following steps from this link: Get support - Microsoft 365 admin | Microsoft Learn to raise a support ticket from admin center or calling the phone support to contact Microsoft Support: Customer service phone numbers - Microsoft Support.

Also, you can look for the way to find your admin through this link: How do I find my Microsoft 365 admin? - Microsoft Support.

In addition, I strongly recommend submitting feedback directly through the Outlook (new) · Community portal so the issue is visible to the product team.

Once you've submitted your feedback, feel free to share the link here in the comments. I’ll be happy to upvote it to help bring more visibility.   

Lastly, if this response has helped clarify the situation or pointed you toward a helpful next step, please consider marking it as the Accepted Answer. Doing so helps surface this thread for other users who may be encountering the same issue and encourages them to add their feedback as well.

Thank you for your time and for contributing to the community. If you have any follow‑up questions, please don’t hesitate to leave a comment. I’m happy to continue assisting.

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